39578669489 has 2 divisors, whose sum is σ = 39578669490. Its totient is φ = 39578669488.

The previous prime is 39578669477. The next prime is 39578669519. The reversal of 39578669489 is 98496687593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36994675600 + 2583993889 = 192340^2 + 50833^2 .

It is a cyclic number.

It is not a de Polignac number, because 39578669489 - 2⁸ = 39578669233 is a prime.

It is a super-2 number, since 2×39578669489² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39578669089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19789334744 + 19789334745.

It is an arithmetic number, because the mean of its divisors is an integer number (19789334745).

Almost surely, 2^39578669489 is an apocalyptic number.

It is an amenable number.

39578669489 is a deficient number, since it is larger than the sum of its proper divisors (1).

39578669489 is an equidigital number, since it uses as much as digits as its factorization.

39578669489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705438720, while the sum is 74.

The spelling of 39578669489 in words is "thirty-nine billion, five hundred seventy-eight million, six hundred sixty-nine thousand, four hundred eighty-nine".